<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>

    <script>
        let map = new Map([
            ["a","aaa"],
            ["b","bbb"],
            ["c","ccc"]
        ])

        console.log(map)
        let set = new Set([
            ["aaa","a"],
            ["bbb","b"],
            ["ccc","c"]
        ])
        console.log(set)
    </script>
</head>
<body>



</body>
</html>